On Sat, Dec 1, 2012 at 8:22 PM, Rishabh Dixit <[email protected]> wrote:
>>>> for i in range(10):
> ... Sum(1/(ls[i]**ls[i]),(ls[i],1,oo)).evalf()
> ...
>
>>>> solve([ls[0]+5*ls[1]-2,-3*ls[0]+6*ls[1]-15])
> {a0: -3, a1: 1}
Rishabh, basically the difference between what you are saying and I am
saying is, in the first example above you are still using i as a name
for Python builtin integer above and not a symbolic object and in the
second example, you're not using any symbolic i at all. Python lists
can take integer indices just fine. They can't take symbolic indices.
Try:
avals=list(symbols('a:10'))
i=symbols('i',integer=True)
print(summation(avals[i],(i,0,9)))
and you will see what I am talking about.
--
Shriramana Sharma
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